(x+3y-2z)(x-3y-2z)-(x+3y-2z)^2 要过程

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(x+3y-2z)(x-3y-2z)-(x+3y-2z)^2 要过程
还有一道：
填空：（x-y+1）（x+y-5）=（x-y-2+_____)(x+y-2-_____)=[(x-2)-(____)]*[(x-2)+(____)]=(____）^2-(____)^2=_________

(x+3y-2z)(x-3y-2z)-(x+3y-2z)^2
=(x+3y-2z)[(x-3y-2z)-(x+3y-2z)]
=(x+3y-2z)(-6y)
=-6xy-18y²+12yz
再问：（x+3y-2z)^2的平方呢
再答：提取公因式(x+3y-2z) 另一个因式是 [(x-3y-2z)-(x+3y-2z)] （x-y+1）（x+y-5）=（x-y-2+3)(x+y-2-3)=[(x-2)-(y-3)]*[(x-2)+(y-3)]=(x-2）^2-(y-3)^2=x²-4x-y²+6y-5

试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y) x+y-z=6 x-3y+2z=0 3x+2y-z=0 求x、y、z 要过程 x/2=y/3=z/5 x+3y-z/x-3y+z 1.（x+y-z)+(x-y+z)-(x-y-z) 2.2x-(3x-2y+3)-(5y-2) 2x+3y-4z=0.,3x+4y+5z=0,则x+y+z/x-y+z详细的解题过程三元方程求救要过程2x+3y+z=383x+4y+2z=564x+5y+z=66x:y=5:3x:z=7:32x-y-z 因式分解：25x y^2 z^2 (x+y-z)-30xyz(z-x-y)^2+5x y z^3 (z-x-y) 已知x,y,z 大于0,x+y+z=2,求证 xz/y(y+z)+zy/x(x+y)+yx/z(z+x)大于等于2/3 x=y/z=z/3,x+y+z ＝12,求2x+3y+4z是多少, (y-x)/(x+z-2y)(x+y-2z)+(z-y)(x-y)/(x+y-2z)(y+z-2x)+(x-z)(y-z x+y+z=20,3x+2y+z=50过程谢谢如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y,